It's tough to find US cards at affordable prices. The "used goods" market in Japan is just like the "new goods" market - overpriced. There just isn't very many places for normal people to sell their cards, so the card stores can charge high prices. There is Yahoo! Auctions, the Japanese equivalent of eBay, but like in the States, shipping is a factor on lower-priced items.
I spend way too much time with cards. You can figure at least an hour a day writing my post, scanning and inventorying my cards, and just doing general odds and ends. Add browsing on eBay, COMC, Just Commons, and SportsLots, and the time it takes to get to the card stores when I make what seems to be weekly rounds, and I'm sure I "waste" 20 hours a week!
But the fun in writing and getting comments (even when I'm too "busy" or tired to properly reply for a few days), trading, and the thrill of the hunt keeps me going.
And going, and going. My Sunday or Monday card store excursions generally last 5-7 hours, including the train rides into and around Tokyo and back home again, and walking to the stores. I get some good exercise putting several kilometers on my shoes, and sometimes I'm rewarded with an interesting find.
2014 Topps is old news, I suppose, but I still want those '89 Minis so I can build a set. I started the act of putting together a set when I found a handful of minis at a local shop: